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Analysis of Causes for Decrease in Measurement Accuracy of High Temperature Liquid Meter
In the process of using a high temperature liquid flow meter, it is sometimes found that the accuracy will be reduced. The reasons for this summary are as follows:
1. Changes in fluid temperature and pressure may cause the air contained in the pipeline to escape from the air contained in the pipeline or because the pressure in the pipeline is lower than the saturated vapor pressure of the fluid, causing part of the liquid to become steam, or may be caused by the negative pressure of the medium. The gas is sucked into the pipeline. These gases flow along with the measured fluid, causing the indicator value of the instrument to increase, causing a positive error, which is detrimental to the demand of the fluid.
2. The bad working environment will also have a great impact on the measurement results of high-temperature liquid flowmeters, such as electromagnetic field interference, dust, high temperature, vibration, and humidity, which may cause malfunction or failure of the turbine flow sensor, directly causing the flowmeter to Indication error, the error is positive or negative, it may not be obvious, or it may completely fail. For the above phenomenon, when it is more serious, problems can be found in the comparison of the working status of the process, and it is easy to take corresponding measures. However, in the early stages of the problem, problems could not be discovered without special measures.
3, the media generally have some impurities, wear on the bearings, shafts, so that the gap between the two increases, the dynamic balance of the moving parts is destroyed, the speed is reduced, or dirt into the gap, so that increased resistance to movement , Speed drops. All of these reasons cause the display value of the instrument to decrease, causing a negative error, which is detrimental to the fluid supplier.
4. The fibrous or viscous impurities in the fluid are attached to the rotating part of the liquid flow meter, which increases the rotational resistance, causing the indicator value of the instrument to decrease, causing a negative error, which is unfavorable to the fluid supplier.
Therefore, the meter needs regular maintenance to ensure the normal long-term use of the meter.